com.cloudera.oryx.app.serving.AbstractConsoleResource.java Source code

Introduction

Here is the source code for com.cloudera.oryx.app.serving.AbstractConsoleResource.java

Source

/*
 * Copyright (c) 2015, Cloudera and Intel, Inc. All Rights Reserved.
 *
 * Cloudera, Inc. licenses this file to you under the Apache License,
 * Version 2.0 (the "License"). You may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * This software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
 * CONDITIONS OF ANY KIND, either express or implied. See the License for
 * the specific language governing permissions and limitations under the
 * License.
 */

package com.cloudera.oryx.app.serving;

import javax.annotation.PostConstruct;
import javax.servlet.http.HttpServletResponse;
import javax.ws.rs.GET;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;

import java.io.IOException;
import java.net.URL;
import java.nio.charset.StandardCharsets;

import com.google.common.io.Resources;

/**
 * Superclass of web resources that contain a small console for a Serving Layer application.
 * It applies a common header and footer around content from subclasses.
 */
public abstract class AbstractConsoleResource {

    private String html;

    @PostConstruct
    public final void loadHTML() throws IOException {
        StringBuilder htmlBuilder = new StringBuilder(10000);
        for (String resource : new String[] { "console-header.html.fragment", getConsoleResource(),
                "console-footer.html.fragment" }) {
            URL resourceURL = Resources.getResource(AbstractConsoleResource.class, resource);
            htmlBuilder.append(Resources.toString(resourceURL, StandardCharsets.UTF_8));
        }
        html = htmlBuilder.toString();
    }

    protected abstract String getConsoleResource();

    @GET
    @Produces(MediaType.TEXT_HTML)
    public final String getHTML(@Context HttpServletResponse response) {
        response.setHeader("X-Frame-Options", "SAMEORIGIN");
        response.setHeader("Cache-Control", "public");
        return html;
    }

}